using System;

namespace ICSharpCode.TextEditor
{
    public struct TextLocation : IComparable<TextLocation>, IEquatable<TextLocation>
    {
        public static readonly TextLocation Empty = new TextLocation(-1, -1);

        private int x;

        private int y;

        public int X
        {
            get
            {
                return x;
            }
            set
            {
                x = value;
            }
        }

        public int Y
        {
            get
            {
                return y;
            }
            set
            {
                y = value;
            }
        }

        public int Line
        {
            get
            {
                return y;
            }
            set
            {
                y = value;
            }
        }

        public int Column
        {
            get
            {
                return x;
            }
            set
            {
                x = value;
            }
        }

        public bool IsEmpty => x <= 0 && y <= 0;

        public TextLocation(int column, int line)
        {
            x = column;
            y = line;
        }

        public override string ToString()
        {
            return string.Format("(Line {1}, Col {0})", x, y);
        }

        public override int GetHashCode()
        {
            return (87 * x.GetHashCode()) ^ y.GetHashCode();
        }

        public override bool Equals(object obj)
        {
            if (!(obj is TextLocation))
            {
                return false;
            }
            return (TextLocation)obj == this;
        }

        public bool Equals(TextLocation other)
        {
            return this == other;
        }

        public static bool operator ==(TextLocation a, TextLocation b)
        {
            return a.x == b.x && a.y == b.y;
        }

        public static bool operator !=(TextLocation a, TextLocation b)
        {
            return a.x != b.x || a.y != b.y;
        }

        public static bool operator <(TextLocation a, TextLocation b)
        {
            if (a.y < b.y)
            {
                return true;
            }
            if (a.y == b.y)
            {
                return a.x < b.x;
            }
            return false;
        }

        public static bool operator >(TextLocation a, TextLocation b)
        {
            if (a.y > b.y)
            {
                return true;
            }
            if (a.y == b.y)
            {
                return a.x > b.x;
            }
            return false;
        }

        public static bool operator <=(TextLocation a, TextLocation b)
        {
            return !(a > b);
        }

        public static bool operator >=(TextLocation a, TextLocation b)
        {
            return !(a < b);
        }

        public int CompareTo(TextLocation other)
        {
            if (this == other)
            {
                return 0;
            }
            if (this < other)
            {
                return -1;
            }
            return 1;
        }
    }
}
